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Patched domain-containing protein 4 (PTCHD4)
- Target
- PTCHD4
- Molecular classification
- Membrane protein, Receptor (Patched family), Sterol-sensing domain-containing protein, Other (potential repressor of Hedgehog signaling)
01
Overview
Patched domain-containing protein 4 (PTCHD4) is a membrane protein belonging to the Patched family, characterized by 12 transmembrane domains and a sterol-sensing domain. It is transcriptionally induced by p53 and regulated via m^6A RNA modification, particularly in response to cellular damage and during senescence. PTCHD4 acts as a putative repressor of the canonical Hedgehog signaling pathway by antagonizing the effects of Smoothened (SMO), demonstrated by the down-regulation of Hedgehog pathway target genes. It sustains the expression of Wnt pathway components relevant to proliferation and survival in senescent fibroblasts and is implicated in the survival of senescent cells and resistance to apoptosis and senolytic agents. Increased PTCHD4 has been observed in cancers such as colorectal and gastric cancer, suggesting roles in tumor biology and cellular aging. No approved drugs specifically target PTCHD4 as of current data.
- Other names
- Patched domain-containing protein 4PTCHD4C6orf138PTCH53SLC65C2FLJ41841dJ402H5.2p53-regulated patched proteinpatched domain-containing protein C6orf138
02
Mechanism of action
Antagonism of SMO (Smoothened) in the Hedgehog pathway, leading to repression of Hedgehog signaling
03
Biological functions
Signal transductionTranscriptional regulation (via Hedgehog pathway)Regulation of cell proliferationRegulation of cell survival, particularly in cellular senescence
04
Disease associations
Cancer (notably colorectal and gastric cancers)Senescence-related diseasesPotential association with Bardet-Biedl syndrome 9
05
Biomarkers
Increased PTCHD4 expression may indicate cellular senescence or involvement of p53-dependent arrest in cancer or aging
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